Wide Blade Axial Flow Blood Pump Magnetic Bearing Design
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Solution Overview
Problem
Existing axial flow blood pumps face limitations in torque capacity and efficiency due to thin blade designs and mechanical rotor support, which can lead to mechanical wear and failure, and require additional support structures, making them less reliable and more prone to hemolysis and thrombosis.
Innovation Solution
A blood pump design featuring wide, blade-like projections with hydrodynamic thrust bearings and magnetic bearings, which increases motor torque capacity, reduces mechanical wear, and eliminates the need for additional support structures, while maintaining low hemolysis and thrombosis risks through improved fluid handling and pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin blade design is used with mechanical bearings, then rotor support is provided, but torque capacity and reliability are reduced due to mechanical wear
Solution Approach 1:
The patent replaces mechanical bearings with magnetic bearing technology that uses magnetic fields to support the rotor, eliminating mechanical contact and wear. The magnetic bearing system provides rotor support without physical contact, thereby eliminating the harmful mechanical wear while maintaining reliability.
Solution Approach 2:
The patent changes the blade design from thin to wide blades, which increases the magnetic flux area and improves torque capacity. This parameter change in blade width directly enhances the motor's torque capability while the magnetic bearing system maintains reliability by eliminating mechanical wear.
2Power
If thin blade design is used, then pump width is reduced, but torque capacity and efficiency are reduced
Solution Approach 1:
The patent changes the blade width parameter from thin to wide, which increases the magnetic flux area and improves torque capacity. This parameter change directly enhances the motor's torque capability by increasing the area available for magnetic flux interaction.
Solution Approach 2:
The patent uses composite construction where wide blades are combined with magnetic bearing technology, creating a system that achieves both high torque capacity and reduced width. The composite approach integrates the benefits of wide blades for torque with the space-saving magnetic bearing system.
3Reliability
If mechanical bearings are used for rotor support, then rotor positioning is achieved, but hemolysis and thrombosis risks increase due to mechanical contact
Solution Approach 1:
The patent replaces mechanical bearings with magnetic bearing technology that uses magnetic fields to support the rotor, eliminating mechanical contact and wear. The magnetic bearing system provides rotor support without physical contact, thereby eliminating the harmful mechanical wear while maintaining reliability.
4Stability of the object's composition
If additional support structures are added to thin blade designs, then rotor stability is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical support structures with magnetic bearing technology that uses magnetic fields to stabilize the rotor. This substitution eliminates the need for additional mechanical support structures while maintaining rotor stability, thereby reducing device complexity.
Solution Approach 2:
The magnetic bearing system serves multiple functions simultaneously: it provides rotor support, maintains rotor positioning, and ensures rotor stability without requiring separate mechanical support structures. This multi-functionality reduces the overall device complexity while achieving the desired stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances torque capacity, reduces mechanical wear, and minimizes hemolysis and thrombosis risks, providing a reliable, sealless, and efficient blood pumping solution with improved anatomical compatibility and reduced anticoagulant use.
Implementation Method 1
A motor is provided, the motor having a plurality of magnetic poles of a magnet or magnets carried by the impeller. A motor stator is provided, which includes an electrically conductive coil located adjacent to or within the housing.
Implementation Method 2
Hydrodynamic bearing surfaces may also be present, being symmetrically located around the impeller. The term 'hydrodynamic bearing surfaces' implies that the bearing surface is acting against fluid to impart forces to the rotor, which helps to position the rotor.
Data Source
AI summary
A blood pump comprises a pump housing; a rotor positioned in the housing and comprising an impeller having a hydrodynamic surface for pumping blood; and a motor including a plurality of magnets carried by the impeller, plus a rotor stator, including an electrically conductive coil located adjacent to or within the housing. The impeller comprises radially outwardly extending, bladelike projections that define generally longitudinally extending spaces between the projections. The shape of the projections and the spaces therebetween tend to drive blood in the spaces in an axial direction as the impeller is rotated. The spaces collectively have a total width along most of their lengths at the radial periphery of the rotor, that is substantially equal to or less than the collective width of the projections along most of their lengths at the radial periphery. Thus, the bladelike projections are thicker, achieving significant advantages.